MUHAMMAD ABDUL NAFI’. Application of the Problem Based Learning Model in Increasing Student Activity and Learning Outcomes in Beautiful Materials Mutual Respect. Research Journal on Teacher Professional Development, [S. l.], v. 3, n. 01, p. 46–58, 2025. DOI: 10.21580/rjtpd.v3i01.24881. Disponível em: https://journal.walisongo.ac.id/index.php/rjtpd/article/view/24881. Acesso em: 8 jun. 2026.